unstable equilibrium

Noun

(physics) an equilibrium in which a small disturbance causes it to move further away from the original state

Japanese Meaning

小さな摂動により元の状態からさらに離れる傾向にある平衡状態（不安定な平衡状態）

A pencil balanced on its tip is an unstable equilibrium that will fall with the slightest breeze.

鉛筆を先端で立ててバランスをとると、それはわずかな風で崩れる不安定な平衡状態にある。

Sense（1）

(physics) an equilibrium in which a small disturbance causes it to move further away from the original state